Cambridge & Pearson Edexcel Past Paper Questions

Chlorine reacts with sodium hydroxide. Cl2(g) + 2NaOH(aq) → NaCl(aq) + NaClO(aq) + H2O(l)

When rubber is heated in the absence of air, a small amount of isoprene is formed. The structure of isoprene is shown. H H H C=C—C=C H H H

At 200°C and 200 atmospheres pressure, phosphorus(V) chloride forms an equilibrium mixture with phosphorus(III) chloride and chlorine. PCl5(g) ⇌ PC...

A student is given only the nucleon number of an atom. What can be deduced about the structure of the atom?

Two experiments were carried out. In experiment 1, ammonium carbonate was reacted with dilute hydrochloric acid. In experiment 2, ammonium carbonat...

A paper chromatography experiment is carried out to find an Rᶠ value for Fe³⁺(aq). The result is shown. To make the spot containing Fe³⁺(aq) more v...

The graph gives the melting points (m.p.) of mixtures of lead and tin. The graph shows that any mixture of lead and tin must have a melting point t...

Some students wrote three statements about the bonding in a molecule of ammonia, NH₃. 1 A nitrogen atom has three outer electrons so all outer elec...

The table shows some properties of four solid elements. Which element could be graphite?

Which statement about chlorine atoms and chloride ions is correct?

Four gases are listed. 1 CH₄ 2 NH₃ 3 CO₂ 4 N₂ 1 mol/dm³ of each of gases 1 – 4 is allowed to diffuse. What is the order of their rate of diffusion ...

Which diagram best represents the structure of a solid metal?

A compound containing only the elements carbon and hydrogen has 80.0% by mass of carbon. What is its empirical formula?

An ionic compound has the formula XY, where Y is a non-metal. Which statement about XY is correct?

In an experiment, 1 cm³ of a gaseous hydrocarbon, Z, requires 4 cm³ of oxygen for complete combustion to give 3 cm³ of carbon dioxide. All gas volu...

Aqueous copper(II) sulfate is electrolysed using copper as the positive electrode and carbon as the negative electrode. Which row gives correct inf...

Molten salts of four metals are electrolysed. The ions of which metal require the smallest number of electrons for one mole of atoms to be liberate...

Which two products are formed during photosynthesis?

A student investigates how the concentration of a reagent affects the rate of a chemical reaction. Which piece of apparatus is essential for all ra...

Gold is used as a catalyst in some chemical reactions. In these reactions, gold • helps reduce the energy costs of the reaction. • increases the yi...

The table shows some properties of four metal chlorides. Which row is magnesium chloride?

Which row shows the pH values for 0.1mol/dm³ solutions of ammonia, hydrochloric acid, sodium chloride and sodium hydroxide?

The diagram shows the apparatus used to extract aluminium from aluminium oxide. Which statement about this process is correct?

A student has five reagents. • dilute hydrochloric acid • dilute sulfuric acid • dilute nitric acid • solid calcium carbonate • solid copper(II) ca...

Which reaction is not a redox reaction?

Some properties which make elements different from each other are listed. 1 metallic character 2 number of electron shells in an atom 3 number of p...

Aqueous copper(II) sulfate solution is placed in an iron container and left to stand for several days. Which statement describes what happens?

Which equation shows a reaction that will occur at room temperature and pressure?

Which compound is used as a fertiliser?

In the Haber process, hydrogen and nitrogen react to form ammonia in the presence of a catalyst. Which of the two reactants is obtained by fraction...

An element, Z, from Group II of the Periodic Table reacts with chlorine, an element from Group VII. What is the formula of the ionic compound formed?

The table shows treatments used for drinking water supplies and reasons for using those treatments. Which row is correct?

The table shows some atmospheric pollutants and their possible effects. Which row is not correct?

How many moles of ethanoic acid, CH₃CO₂H, react with one mole of magnesium?

The diagram shows the structures of two hydrocarbons, X and Y. Two students make the following statements. Student 1 Hydrocarbon X is an isomer of ...

The diagram shows the structure of an ester. What is the name of this ester?

An unsaturated hydrocarbon with six carbon atoms contains only three C=C double bonds. This hydrocarbon is reacted with excess hydrogen at a high t...

Compound Q has the formula C₄H₁₀. Which statement about compound Q is correct?

Hydrolysis of R, a macromolecule, gives a mixture of amino acids. What is R?

When measured under the same conditions, which gas diffuses at the same rate as nitrogen?

When calcium carbonate is added to dilute hydrochloric acid, carbon dioxide gas is released. Three sets of apparatus are shown. Which sets of appar...

Benzene and cyclohexane are both flammable liquids. They are able to mix with each other without separating into two layers. They have very similar...

The graph gives the melting points (m.p.) of mixtures of lead and tin. The graph shows that any mixture of lead and tin must have a melting point t...

When substance Q melts, only weak forces of attraction between its molecules are overcome. Which row correctly describes Q?

A solution containing lead(II) ions is added to a solution containing iodide ions. A yellow precipitate is formed. What is the equation for the rea...

Buckminsterfullerene has the chemical formula C60. How is the structure of buckminsterfullerene best described?

Aqueous sodium hydroxide is added to a sample of a colourless solution. Aqueous ammonia is added to a separate sample of the colourless solution. I...

Which is the best conductor of electricity?

An endothermic reaction has an activation energy of x. Which energy profile diagram is correct for this reaction?

The following statements refer to the use of catalysts in chemical reactions. 1 A catalyst increases the activation energy of a reaction. 2 A catal...